Window or wall ventilator



SEpt. 23, 1952 w. H. BRASKAMP 2,611,608

wmnow 0R WALL VENTILATOR Filed Feb. 13, 1951 1 7/6 Td/Q MAL/441.516)! l/f ym Patented Sept. 23, 1952 UNITED T Willein Hendrik Braskamp, Voorburg,1 ;Netherlands: a i

Application'Febru'a'ry 1a, 1951, Serial No. 210,720

'In the Netherlands February 17, 1950 The present invention relates to a window or *tilator comprisingaishutter operating'mechawall ventilator, comprising a-movable shutter nism, arranged-in accordance with the: .present for obturating the air passage at will. r invention. .21";

The invention is more particularlyconcerned Fig. 2 is a detailed sectional perspective view with the mechanism for operating such. shutter- 0 of a portion of Fig. 1.

and has for its object to so design such mech- {The'ventilator i to be arranged inan opening anism that displacementof the shutter, in .either "ofawindow or wall,'is. provided with-a hood 2 direction, may be efiected or, initiated '-.byexserving as ashutter for theairpassage andarerting an operating force which has the same ranged for cooperation with. the edge of a vendirection for both directions of movement of tilator frame portion, such. hood being shown in the shutter. I full lines in r the closed position andin dotted To this end the invention provides a window lines in open position.

or wall ventilator comprising in, combination a The hood 2 is mounted .to slide in guideways3 movable shutter for obturating the air passage, of the ventilator frame and is provided with a a member for operating such shutter, a snap pin 4 engaged by the forked end of a bell crank pawl for blocking said shutter operating memlever 5, 5 serving as shutter operating element her in one end position thereof against moveand being pivotally mounted. on a fixed axis 6, ment by a return force,.a pawl lifting member such bell crank lever being acted upon by a-toradapted to rock on an axis carried by said shut- 'sion spring 1 surrounding said axis 16, and in ter operating member and means for exerting on the embodiment shown being arranged to urge said pawl lifting member, at a certain point of said bell crank lever in a directionin which the in d n a Operating force in a d r tion 01 shutter is caused to open the air-passage. DOs to said re u n fo ce. ai pawl lifting In the closed position of the shutter, as shown member, in free condition, tending to take up a in full lines, the lever 5, 5 is held against the position in which the point of incidence of said action of the spring I, by a pawl formed as 2. Operating f rce li s yon Said rocking axis at curved blade spring 8, which on the one hand the side facing said snap pawl, and in the other is attached to the ventilator casing and on the end Position of Sa hu er Op a n em other hand resiliently engages a recess 9 formed y p ra on W th an abutment, is e d a a nst in the free end of the arm 5', of the bell crank such tendency in a position in which said point lever. Beneath said recess, the arm 5' is proof incidence is beyond said rocking axis at the vided with a rounded nose ill, designed for acting opposite side thereof all in such a manner, that upon the blade spring in a manner further to be upon exertion of the operating force in the described. blocked end position of the shutter operating The arm 5' of the bell crank lever further car'- member, said pawl lifting member is rocked to ries at a short distance from its free end, a U- lift said snap pawl and upon exertion of a simishaped element H, which from above straddles larly operating force in the other end position said lever arm and is pivotally connected thereof the operating member, is rocked in a directo by a short stud I2 surrounded by a torsion tion to engage the operating member and transspring I3, which normally urges said U-shaped mit the operating force thereto. 40 element to pivot in clockwise direction as seen in More particularly, according to a further the drawing. This angular movement is limited characteristic feature of the invention said pawl by an abutment pin I4, carried by said bell crank lifting means may consist of a spring loaded U- lever. The element H at the point of incidence shaped element, pivotally straddling one arm of I5 has attached thereto a chain or other pulling a bell crank lever functioning as the shutter opmember I 6 on which the operating force is to be crating element, such bell crank lever being exerted. This point of incidence I5 is so selected,

adapted to exert an operating force on said shutthat in the free position of the element l I, that ter against the action of a spring, said U-shaped is in the position reached by its clockwise angular element at the point of attack of the operating displacement, it is situated beyond the stud [2 force having a pulling member attached thereto. at the side facing the pawl 8. In this position The invention will hereinafter be further dethe respective edge of the element engages the scribed with reference to the accompanying pawl spring, however with a pressure, which is drawing. insufficient to overcome the force of the spring.

Fig. 1 is a side elevational view partially in In this position the element II is still free from section, of a portion of a window or wall venthe abutment pin l4.

Departing from the full line or blocked position of the bellcrank lever in the embodiment shown corresponding to the closed position of the shutter, an operating force exerted on the chain IE will first cause the element H to further rock in clockwise direction, causing the pawl spring to be disengaged from the recess 9, there by releasing. theibell crank lever, so that upon release of said chain;=the torsion spring 1' will move the bell crank lever into its dotted line position, corresponding with opened shutter,

since the rounded nose I!) is then able to pass the pawl spring.

Near the end of the opening movement of the bell crank lever, the upper lefthand corner of the element H engages an abutment, which, in the embodiment shown, is formed by the ven- 7 member toward one of its, end positions, a pawl positioned to engage said member and retain it against the action of said spring when in its other end position, a pawl-lifting member pivotallymounted on said operating member, actuating 'means for exerting on said pawl-lifting member an actuating force in opposition to said spring means, the pivotal mounting of said pawllifting member on said operating member being such as to enable rocking movement of said tilator casing, thereby causing rocking of the element II in anti-clockwise direction towards its dotted position, the point of incidence l5 of the pulling chain 16 then being, to the left of the "stud 12.; In :this position the element H is held. h

In order to close the air passage, one only needs to again exert a pulling force on the chain l6, causing the element H to rockanti-clock- Wise (compare. lower dottedlposition of the element l I) said elementthereby engaging the arm 5" of the bell crank lever and transmitting the operating force thereto, causing the shutter to be moved towards the right, against the action of the torsion spring 1, that'is causing the shutter to open the air passage.

During this movement of the bell crank lever about its axis, the. rounded nose HJ- forces the blade spring back, whereupon such spring again snaps intothe recess. .9 for blocking the shutter in closed position. 7

- What I claim is: V V i 1. A ventilator comprising a frame element having an opening therein, a shutter 'movable pawl-lifting member between positions where the point of exertion of the actuating force is situated on either side of the pivotal axis of said mounting, and, a spring urging said pawlliiting member to one :of said positions in contact with said pawl;

2. A ventilator as in claim 1 wherein theshutter operating member is in the vform of a bell- -orank lever pivoted on the. frame pelementand having one end operativelyconnected; to the movable shutter, the, pawl-lifting member being U-shaped and pivoted adjacent the ther ,end of the bell crank lever. 1

3. A ventilator as in claim 2 wherein-the U- shapedpawl-liiting element is pivoted to swing from a position inward of its point of pivotal attachment to the bell-crank lever, and abuttin therethrough to a position outward of said: attachment point and embracing at least part .of the adjacent end of said lever.

. WILL-EM HENDRIK .BRASKAMP.

No referencescited. 

